San Antonio Oeste climate — normals and trends
San Antonio Oeste (Argentina) has a cold semi-arid climate (BSk) under the Köppen-Geiger classification. Its mean annual temperature is 15.4 °C and it receives 278 mm of precipitation per year.
These figures are normals computed over 86 complete calendar years, from 1940 to 2025, using ERA5 reanalysis data from the Copernicus programme.
The warmest month is January (22.7 °C on average) and the coldest is July (8.1 °C). Rainfall peaks in March.
San Antonio Oeste averages 4 frost days, 21 hot days (≥ 30 °C) and 48 rainy days per year.
San Antonio Oeste has warmed by +0.3 °C between 1940 and 2025, or +0.03 °C per decade. This trend is statistically significant.
The hottest day of the period reached 39.5 °C (on 5 January 1955) and the coldest -5.4 °C (on 30 June 2025).
Data from ERA5 reanalysis (Copernicus Climate Change Service), redistributed under a CC-BY 4.0 licence. Normals are recomputed whenever the archive is updated.
Climate normals · ERA5
San Antonio OesteRio Negro
- coords
- -40.73°, -64.95°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
15.4°C
Average daily high
20.0°C
Average daily low
11.2°C
Annual rainfall
278mm
Sunshine / day
10.4h
Mean relative humidity
56%
Average peak wind
27.6km/h
Seasonal range
14.6°C
Frost days (< 0 °C)
4 d/yr
Hot days (≥ 30 °C)
21 d/yr
Rainy days (≥ 1 mm)
48 d/yr
Annual snowfall
0.4 cm
Average feels-like high
16.9 °C
Average feels-like low
7.6 °C
Average peak gust
42.6 km/h
Tropical nights (≥ 20 °C)
17 d/yr
Solar radiation
17.7 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+0.3 °C
since 1940
0.0 °C per decade · r² = 0.05 · p = 0.047
Trend fitted by linear regression (ordinary least squares) on annual means. A trend is shown only when it is statistically significant (p < 0.05).
A climograph overlays rainfall (bars) and temperature (line): the standard reading in climatology, where you can see at a glance whether the warm season is also the dry one.
Records for the period
Hottest day
39.5 °C
5 January 1955
Coldest day
-5.4 °C
30 June 2025
Wettest day
88 mm
24 February 2022
Windiest day
71.2 km/h
17 June 2017
Strongest gust
113.8 km/h
13 August 1959
Hottest feels-like
39.7 °C
14 January 1960
Coldest feels-like
-9.8 °C
6 July 1960
Snowiest day
4.2 cm
17 June 1982
Sunniest day
14.8 h
30 December 2025
Normals computed over complete calendar years 1940–2025.
A specific year
Pick a year and see how it compares to normal — warmer, drier or more extreme than usual?
Across the whole year
Month by month
| High | vs. normal | Precipitation | vs. normal | |
|---|---|---|---|---|
| Jan | 29.2 °C | +1.6 °C | 9 mm | -13 mm |
| Feb | 27.3 °C | +0.6 °C | 17 mm | -6 mm |
| Mar | 24.0 °C | 0.0 °C | 28 mm | -3 mm |
| Apr | 18.7 °C | -1.2 °C | 50 mm | +21 mm |
| May | 16.7 °C | +0.8 °C | 7 mm | -15 mm |
| Jun | 13.1 °C | +0.5 °C | 5 mm | -19 mm |
| Jul | 12.8 °C | +0.6 °C | 10 mm | -12 mm |
| Aug | 15.9 °C | +1.6 °C | 10 mm | -6 mm |
| Sep | 17.9 °C | +1.2 °C | 25 mm | +3 mm |
| Oct | 21.8 °C | +1.9 °C | 8 mm | -18 mm |
| Nov | 23.8 °C | +0.3 °C | 23 mm | +1 mm |
| Dec | 27.6 °C | +1.5 °C | 1 mm | -18 mm |
The year's extremes
What was the weather like that day?
Your birthday, a wedding, a memorable trip: discover the actual weather for any date since 1940.
Frequently asked questions
What is the climate of San Antonio Oeste?
San Antonio Oeste has a cold semi-arid climate (Köppen BSk). Over 1940-2025, the average annual temperature is 15.4 °C and it receives 278 mm of precipitation per year.
What is the hottest day ever recorded in San Antonio Oeste?
The hottest day measured in San Antonio Oeste between 1940 and 2025 was 5 January 1955, reaching 39.5 °C.
What is the coldest day in San Antonio Oeste?
The coldest day measured in San Antonio Oeste between 1940 and 2025 was 30 June 2025, at -5.4 °C.
Does it snow in San Antonio Oeste?
Almost never: San Antonio Oeste sees virtually no snow, with about 4 frost days per year.
Has the climate of San Antonio Oeste warmed?
Yes: San Antonio Oeste warmed by +0.3 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in San Antonio Oeste?
The wettest day measured in San Antonio Oeste between 1940 and 2025 was 24 February 2022, with 88 mm of rain in 24 hours.
What was the windiest day in San Antonio Oeste?
The windiest day measured in San Antonio Oeste between 1940 and 2025 was 17 June 2017, with winds reaching 71.2 km/h.
What is the warmest month in San Antonio Oeste?
The warmest month in San Antonio Oeste is January (22.7 °C on average); the coldest is July (8.1 °C).
How much does it rain in San Antonio Oeste?
San Antonio Oeste receives on average 278 mm of precipitation per year, spread over about 48 rainy days.
Is it sunny in San Antonio Oeste?
San Antonio Oeste gets on average 10.4 hours of sunshine per day, roughly 3,796 hours per year over 1940-2025.
What is the biggest single-day snowfall in San Antonio Oeste?
The heaviest 24-hour snowfall measured in San Antonio Oeste between 1940 and 2025 was 17 June 1982, with 4.2 cm.
Are there tropical nights in San Antonio Oeste?
Yes: San Antonio Oeste has on average 17 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in San Antonio Oeste?
In San Antonio Oeste, between 1940 and 2025, the highest apparent temperature reached 39.7 °C on 14 January 1960, and the lowest was -9.8 °C on 6 July 1960.
Compare San Antonio Oeste with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around San Antonio Oeste